Make magic ice cubes
Don't drink this! This is another one of our favorite science meets magic anti-gravity tricks.
Ever see an ice cube sink?
Don't think so! If ever you do, don't dare take a sip.
The magic behind this trick is not the ice cube, but the "water". All you need is rubbing alcohol and an audience that's not sniffing your glass. The density of water is greater than alcohol, so the cube sinks in one glass and floats in another. Voila.